Done with `autopep8 --select=E2,W2`, fixes:

- E201 - Remove extraneous whitespace.
- E202 - Remove extraneous whitespace.
- E203 - Remove extraneous whitespace.
- E211 - Remove extraneous whitespace.
- E221 - Fix extraneous whitespace around keywords.
- E222 - Fix extraneous whitespace around keywords.
- E223 - Fix extraneous whitespace around keywords.
- E224 - Remove extraneous whitespace around operator.
- E225 - Fix missing whitespace around operator.
- E226 - Fix missing whitespace around operator.
- E227 - Fix missing whitespace around operator.
- E228 - Fix missing whitespace around operator.
- E231 - Add missing whitespace.
- E231 - Fix various deprecated code (via lib2to3).
- E241 - Fix extraneous whitespace around keywords.
- E242 - Remove extraneous whitespace around operator.
- E251 - Remove whitespace around parameter '=' sign.
- E261 - Fix spacing after comment hash.
- E262 - Fix spacing after comment hash.
- E265 - Format block comments.
- E271 - Fix extraneous whitespace around keywords.
- E272 - Fix extraneous whitespace around keywords.
- E273 - Fix extraneous whitespace around keywords.
- E274 - Fix extraneous whitespace around keywords.
- W291 - Remove trailing whitespace.
- W293 - Remove trailing whitespace.